pub fn ring_lift_slope(length_over_diameter: f64) -> Result<f64, AeroError>Expand description
A thin ring wing’s normal-force slope per radian on the area d L, at a length-to-diameter
ratio λ = L/d: Weissinger’s π² / (1 + πλ/2 + λ arctan(1.2 λ)) (Wagner 2021 eq. 15).
§Errors
AeroError::Domain for a λ that is not finite and positive.